Joseph a



:UNITED STATES PATENT i Ormea] JOSEPH A. MUMFORD, OF HAN'ISPOR'I, NOVA SCOTIA, CANADA.y

STEAM-Botten.

SPECIFICATION forming part of Letters Patent N o. 382,657. dated May 8, 1888.

` Application nieu' ocabcr 22, isn.

Serial No. 253.113. (No model.)

.following to be a full, clear, and exact description `of the saine, reference being had to the accompanying drawings, forminga part of this specification, and to theriigures and letters of reference marked thereon.

In the boilers of this class, as heretofore constructed with the outer shell set in an inclined position and with an inclined or tapering yfirebox in one'end of the same, difliculty has beenv experienced in obtaining sufficient line-room onv the head of the ire-box to adapt-the boiler for use when the water is impure and at the same time keep the fire-box and flues at all times below the level of the water; and, further, it has been found that the gases and products of combustion were not fully consumed nor their heat utilized before they were allowed to pass off up the chimney. y

The object of my present invention is to overcome the above-mentioned defects, reduce the cost of manufacture, and adapt the boiler for use under certain conditions which would render other boilers of the class undesirable and expensive, the said invention consisting in certain novel details in the construction of the tire-box and the boiler and ,in the setting of the latter, as will be hereinafter described, and pointed out particularly in the claims at the end of this specification.

In the accompanying drawings, Figure 1 is a longitudinal vertical section of a boiler and setting constructed in accordance with my invention. Fig. 2 is a top plan view of the boiler, showing the triangular shape of the dat top section of the tire-box.

Similar letters of reference in both ftgurcsinl dicate the same parts.

' Referring to Fig. l, it Will be seen that the outer shell, A, of the boiler is held in an inclined position in the setting by ordinary steps or projections bolted to its sides. At the front endis located the tirebox B, fitting within, and for a large part of its circumference being parallel with, the'said outer shell. The front edges of the shell and fire-box may be simply brought together and riveted,vbut are preferfor the furnace and ashpit doors. The fiyre-boxis vconstructed cylindricahiso 'front C, leaving only about sufficient open space as to lie parallel to the outer shell exceptfor t a comparatively small area at the top, where it is made fiat or level from front to rear. This dat section D, (see Fig. 2,) it will be seen, is triangular in shape, and may be stayed and bolted,` to the outer shell by bolts E, so as to render the same as strong as the cylindrical portion. i v

' The iiue-tubcsF are secured in the end of the tire-box, either slightly inclined from-front to rear or inline with the top of the tire-box, as may be desired, running parallel, however, with the outer shell at the sides. be seen that while I have an increased fluespace, and consequently an increased number of dues, I keep all parts of the ire-box and dues below the level of the Water, whichis shown in dotted lines.

As before mentioned, it has been found that It will thus much of the heat and gases generated in the Y firebox passes off without being utilized but in the present instance I make use of thespace H beneath the upper-end of the boiler as a combustion-chamber,whereinl may, by letting in air or steam,burn the unconsumed gases and pass the heat so generated, together with that which passes throughY the ilues, beneath and around theoutside of the outer shell back to the space above the front end of the boiler, where it passes off up the smoke-stack or chiruney I. As a further means of utilizing `this space beneath the rear end of the boiler, I may locate therein a grate, K, for burning sawdust or other lightfuel to assist in consuming thev 'l before-mentioned gases.y The rear end of the setting is provided with furnace and ash-pit doors L, as in an ordinary furnace, an upper door, L', being provided for cleaning or rep'airy ingv the rear end of. the uesin the boiler. *For the purpose of injecting air or. steam into the said chamber or space a perforated pipe, IVI, is shown located just above the furnace-door, the perforations being pointed downward. to assist in the draft, and when the grate K is used for roo burning fine fuel to assist in its combustion, according to a well-known principle governlng the burning of fine fuel. I do not, 110W- ever,wish to be limited to this precise construction,as it is obvious that perforations may be made in the wall, or any of the well-known forms of blowers or injectors may be employed and accomplish the same result in a more or less efficient manner.

At the front end of the boiler,beside the furnace and ashlpit doors,adoor for cleaning the space beneath the boiler-shell is provided. It 1s obvious that the tire-box may be rst formed cylindrical and then the top section bent 1n, in which case the top would either have to be depressed at the center or the diamcter ofthe cylindrical portion increased in order to keep the whole ofthe top section belowr the water-level.

lt will'be seen from the above that I have produced a boilerhighlyelicient and economical 1n use, and one, by reason of its peculiar positlon and arrangement of fire boxes, occupying but very little space.

Havmg thus described my invention, whatI claim as new is 1. The combination, with the inclined cylindrlcal b0i1er,of the inclined partly-cylindrical tirebox located in the same,having the triangular-shaped substantially flat level top sectlon, as set forth.

.2. The combination, with the inclined cylindrical boiler provided with the water-front,as described, of the inclined cylindrical rebox located therein, having the triangular shaped substantially iat top section,and fines connecting the rear end of the dre-box with the rear end of the boiler, substantially as described.

3. The combination,with aninclined boiler having the fire-box in its lower end and dues connecting said firebox with the rear raised end, of arcombustionchamber located beneath its raised end, with an air or steam supply therein and a smoke-exit, substantially as described.

4. The combination,with an inclined boiler,a nre-box located in its lower end, and flues connecting said fire-box with the raised end, of a chamber located beneath said raised end, with lair or steam supply therein, and a smoke-exit above its lower end, whereby the smoke and products of combustion pass from the fire-box through the tlues beneath the forward end of the boiler, commingling with the air or steam therein, thence around over the outside of the boiler, and out over its lower end, as set'forth.

5. The combination,with an inclined boiler, a {ire-box located in its lower end, and dues connecting said tire-box with the raised end, of a secondary fire-box located beneath said raised end through which the productsfrom the rstnamed tirebox pass before reaching the smokeexit, substantially as described.

6. The combination,with an inclined boler,a tire-box located in its lower end, and tlues connecting said tire-box with the raised end, of a grate located beneath said raised end, and doors at the rear of said boiler for supplying fuel to said last-named grate and for removing,r the ashes, substantially as described.

7. The combination, with an inclined cylindrical boiler having the fire-box in its lower end, and tlues connecting said fire-box with the raised end, of a grate and combustion-chamber located beneath said raised end, and a smoke exit above its lower end, substantially as described.

JOSEPH A. MUM FORD.

Wtnesses:

KELsEY FRANCIS,

JOSEPH Frsrr. 

